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It should be more than once, but at the HS level, unlike that for NCAA where it clearly says "more than once", a one time wave is widely interpreted to be valid.
I happen to disagree with that, but have no problem going with the flow on it. The NF rule does say "... lateral waving of one arm". Sure sounds like more than once to me. It they mean one wave is OK , than dang it all, say so in print.
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